"Does it sing?"
At my old law firm, that was code for "Is your brief finished?" Admittedly, if you're not a lawyer, the prospect of a singing legal brief will probably leave you cold. But there's truth to the musical metaphor. An elegant legal brief (a written argument submitted to a court) has all the harmony of great prose.
Banishing Legalese From Trial Lawyers' Briefs | Word Craft - WSJ.com